JPS60208662A - Driving system controller for car - Google Patents

Abstract

PURPOSE:To execute speed change by installing a speed change control circuit which receives a control signal from a control circuit and transmits a speed change control signal into an automatic variable transmission and judging the speed change timing on the basis of the characteristic data such as engine output characteristic data, fuel consumption characteristic data, etc. CONSTITUTION:The traveling state of a car such as the stepping-in amount (alpha) of an accelerating pedal, output-shaft torque (T0), and car speed (N0) is detected (101), and the acceleration speed NO' is calculated (102) in a driving system control circuit 4, and the demanded acceleration speed (NO' com) is calculated (103), and the necessary horse power is calculated (104), and fuel consumption rate and throttle opening-degree are calculated (105), and speed change judgement and throttle opening-degree determination are performed (106), and the speed change gear ratio (in) is inputted (107) into a speed change control circuit 3, and a throttle valve actuator 22 is driven (108), and further the next sampling instruction is executed. A speed change judging and throttle controlling circuit 45 compares the fuel consumption rate at present and in the speed change to a new gear ratio, and if the rate is superior with the new gear ratio, output to the speed change control circuit 3 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field] The present invention relates to an automobile drive system control device that realizes a shift that satisfies both fuel efficiency and acceleration performance without using a shift diagram.

[Prior art] Conventionally, in electronically controlled automatic transmissions equipped with a starting device, in order to satisfy both fuel efficiency and acceleration performance, the transmission diagram is changed depending on the rate of change of the throttle opening, or the transmission is operated using a manual switch. The number of types of shift diagrams has increased, the method of determining shift timing has become more complex, and the amount of data to be stored in advance has also increased.

[Object of the Invention] The object of the present invention is to detect signals from each detector that detects vehicle running conditions, pre-stored engine output (torque rotation speed, etc.) characteristic data, fuel consumption characteristic data, starting device characteristic data, etc. Since the automatic transmission is controlled by the drive system (engine control and shift control) by determining the timing of gear shifts based on the characteristic data of The object of the present invention is to provide an automobile drive system control device that can be freely achieved.

[Configuration of the Invention] The vehicle drive system control device of the present invention includes an accelerator pedal depression amount detector that increases or decreases the throttle opening, a detector for other vehicle running conditions such as output shaft torque and vehicle speed, and an engine throttle opening detector. an electronically controlled automatic transmission equipped with a throttle actuator that increases and decreases the speed, a fluid transmission device such as a torque converter and a fluid coupling, and a starting device such as an electromagnetic clutch and an automatic clutch; and the output of the accelerator pedal depression amount detector. an arithmetic circuit that calculates the engine horsepower corresponding to the signal and the output signal of the vehicle running state detector; and stores vehicle characteristic data such as engine output characteristic data, fuel consumption characteristic data, and starting device characteristic data stored in advance. a storage circuit; a control circuit that controls gear shifting with low fuel consumption based on the output signal of the arithmetic circuit and data of the storage circuit; and a control circuit that controls the throttle actuator;
and a shift control circuit that inputs an I control signal and sends a shift control signal to the automatic transmission.

f Effects of the invention] With the above configuration, the automobile drive system control device of the present invention has the following effects:
It has the following effects.

b) The drive system of the automatic transmission is controlled by determining the shift timing based on the detector signal, engine output characteristic data, and fuel consumption characteristic data, and the shift diagram is not used, so the method for determining the shift timing is simple. , the amount of data to be stored in advance can be reduced.

口) You can freely achieve a shift that satisfies both improved fuel efficiency and acceleration without using a shift diagram.

[Embodiment] An automobile drive system control device of the present invention will be explained based on an embodiment shown in the drawings.

As shown in FIG. 1, the vehicle drive system control device l of the present invention includes an accelerator pedal depression amount detector 11 that detects the depression amount (α) of the accelerator pedal 21, and another vehicle running state detector. , an output shaft torque detector 12 that detects the output shaft torque (TO) of an automotive electronically controlled automatic transmission (hereinafter referred to as automatic transmission) 2 equipped with a torque converter that is a starting device, and an output shaft rotational speed. (vehicle speed: NO), an input interface 4A that inputs detection signals from each detector 11, 12, and 13, and a speed change actuator 3! The drive system control circuit 4 includes an output interface 4B that outputs the speed change gear ratio (input) to the speed change control circuit 3 that controls the throttle valve actuator 22, and outputs the throttle opening degree (θ) of the throttle valve actuator 22.

As shown in FIG. 2, the drive system control circuit 4 includes a required acceleration calculation circuit 41, a required horsepower calculation circuit 42, a differentiation circuit 43, a fuel consumption and throttle opening calculation circuit 44. A central processing unit CPU consisting of a shift judgment and throttle control circuit 45, and an engine/vehicle in which engine output data such as fuel consumption characteristics, engine torque characteristics, and torque converter characteristic data and vehicle characteristic data such as vehicle weight are stored in advance. It consists of a data storage circuit ROM.

The required acceleration calculation circuit 41 calculates the required acceleration (QocoM) requested by the driver based on the accelerator pedal depression amount (α) from the accelerator pedal depression amount detector .

The required horsepower calculation circuit 42 receives the required acceleration (MocoM) signal from the required acceleration calculation circuit 41, the output shaft torque (TO) signal from the output shaft torque detector 12, and the vehicle speed detector 1.
The required horsepower (PWreq) is calculated from the vehicle speed (NO) signal from 3 and the output shaft rotational acceleration (simple) signal obtained by differentiating the vehicle speed (NO) with respect to time by the differentiating circuit 43 using the following formula.

Required horsepower Where: JO: Vehicle moment of inertia Force: Torque converter efficiency (function of e) eel/lux converter speed ratio ereq:) Luc converter required speed ratio e=λiNo/
NE ereq=Enter iNo/NEreq where NE: Engine rotation speed NEreq: Required engine rotation speed When calculating the required horsepower (PWreq), first calculate the torque converter required speed ratio (ereq). The torque converter required speed ratio (ereq) is determined by a subprogram that solves the following equation.

Here, Cp: Torque converter '41 i! 41k
number (function of e) τ: Torque converter torque ratio (function of e) After determining the torque converter required speed ratio (ereq), the torque converter efficiency (function of ereq) (77 (ere
q)) and finally calculate the required horsepower (pwreq).

However, in the required horsepower calculation circuit 42, the torque converter required speed ratio (ereq) is determined by calculating the torque converter required speed ratio (ereq) for each gear stage gear ratio (λ1 (i = 1.2
．． 3) Since three types of calculations are performed corresponding to (3)), the required horsepower (P-eq) is also calculated accordingly, and the three types of calculation methods are slightly different.

Three types of torque converter speed ratios (ereq) and required horsepower (PWreq) will be expressed as follows.

e request (i) (i= 1 , 2 , 3 ) PWre
q(i) (i = 1, 2, 3) Also, from the torque converter required speed ratio (ereq), the engine required rotation speed (Ntreq (i) (i = 1.2.3))
from the following equation.

The fuel consumption and throttle opening calculation circuit 44 calculates the required horsepower (PWreq) calculated by the required horsepower calculation circuit 42, the required speed ratio of the lux converter (ereq), the vehicle speed (No), the engine torque characteristic data in the ROM, and the fuel consumption. From the characteristic data, calculate the fuel consumption of the engine state that achieves PWreq for each gear, select the gear ratio with the best fuel efficiency (inneken) and its fuel consumption rate (finn'ew), and Increase the throttle opening (θ input new).

The change judgment and throttle control circuit 45 determines the fuel consumption rate (fλne) when shifting to a new gear ratio (input new).
If the new fuel consumption rate (fλnew) is better in terms of fuel efficiency by comparing w) with the fuel consumption rate (fλnOri) when the current gear ratio (input nov) is maintained without changing gears, the first gear change command is issued. The speed change control circuit 3-5 shown in the figure is output.

The operation of an automatic transmission with three forward speeds and one reverse speed incorporating the automobile drive system control device of the present invention will be explained with reference to FIGS. 3 to 8.

FIG. 3 is a flowchart of the entire system of the vehicle drive system control device of the present invention.

Accelerator pedal depression amount (α), output shaft torque (TO),
Detection of vehicle running conditions such as vehicle speed (NO) 101)
, calculation of acceleration (Sono) in drive system control circuit 4 (102)
, Calculation of required acceleration (f4ocoM) (103),
Calculates the required horsepower (104), calculates the fuel consumption rate and throttle opening (105), determines the gear shift and throttle opening (108), and outputs the gear ratio (λ) to the transmission control circuit S1o7 ), the throttle valve actuator 22 is driven (108), the next accelerator pedal depression amount (α), and the output shaft torque (T).

), performs a sampling command for vehicle speed (NO) (108)
.

FIG. 4 is a flowchart for calculating the required horsepower. (10
After performing 3), read the torque converter characteristic data (110) and calculate the torque converter required speed ratio (e req(i)) from the following formula.
Calculate the torque converter efficiency [η(
112), the required horsepower (Wreq(i)) is calculated based on the following formula, and the process proceeds to (105).

FIG. 5 is a calculation flowchart of fuel consumption rate and throttle opening.

After performing (104), the vehicle moment of inertia (JO),
Read each gear ratio λ1 (i=1, 2.3) (
201) Calculate the required engine torque for each gear ratio based on the following formula202)
, reads engine fuel consumption characteristics from ROM data (203), calculates the fuel consumption rate for each engine state for each gear ratio using the calculation results of (202) (204);
Read engine torque characteristics from ROM data (20
5) Calculate the throttle opening (θ) for each of the above engine conditions (208), and from the calculation results of (204) and (20B,), calculate the minimum fuel efficiency, the gear position at that time, and the Select the throttle opening (θ)207),
Next, read the current gear ratio (8 nov) (208
), (200 and (20B)), the fuel efficiency rate (fλnov) of the engine state at the current gear stage and the throttle opening degree (θ input now) are selected (20
9), then proceed to (10B).

FIG. 6 is a flowchart for determining speed change and throttle opening.

(105) to determine whether the new fuel efficiency rate (fλnew) is greater than the current fuel efficiency rate (fλnose).
01), when λ is smaller than (fλnov ), λnew
The process proceeds to (302) where the gear shift signal is output, and (fλn
Proceed to (303), which sets a larger input as input now and outputs a signal so as not to shift. (302)
, (303) then determines the throttle opening corresponding to the gear ordinary person, performs steps 304), (107), and (10B), and then proceeds to (108).

Figure 7 shows the required horsepower (PWreq) in a diagram showing fuel consumption characteristics.
) is a diagram with superimposed curves.

FIG. 8 shows a method of adjusting the throttle opening for each gear ratio.

The method is not limited to this embodiment, and the following method may be used.

b) The input/output relationship of the required acceleration calculation circuit may be arbitrarily set by the designer so as to provide a comfortable ride for the driver.

Ex) Acceleration may be detected directly by some kind of detector (for example, an acceleration detector) instead of by differential calculation of vehicle speed.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of a drive system control device for an automobile according to the present invention, FIG. 2 is a block diagram of a drive system control circuit of a drive system control device for an automobile according to the present invention, and FIG. A flowchart of the entire system of the system control device, FIG. 4 is a flow chart 1 for calculating the required horsepower of the vehicle drive system control device of the present invention, and FIG. 5 is a fuel consumption rate of the vehicle drive system control device of the present invention. FIG. 6 is a flowchart for determining the speed change and throttle opening of the vehicle drive system control device of the present invention, and FIG. 7 is a fuel optimum gear for the vehicle drive system control device of the present invention. FIG. 8 is a conceptual diagram of how to calculate each throttle opening degree in the drive system control device for an automobile according to the present invention. In the diagram: 1. Automotive drive system control device 2. Automotive electronically controlled automatic transmission 3. Shift control circuit 4. Drive system control circuit 11. Accelerator pedal depression amount detector 1
2. Output shaft torque detector 13. Vehicle speed detector Billing speed calculation circuit 42. Required horsepower calculation circuit 43.
・Differential circuit 44... Fuel consumption and throttle opening calculation circuit 45... Shift judgment and throttle control circuit CP
U... Central processing circuit ROM... Engine/vehicle data storage circuit Agent Kenji Ishiguro Class 21 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] l) An accelerator pedal depression amount detector that increases/decreases the throttle opening, a detector for output shaft torque, vehicle speed, and other vehicle running conditions, a throttle actuator that increases/decreases the engine throttle opening, and a starting device. an electronically controlled automatic transmission comprising: an arithmetic circuit for calculating engine horsepower corresponding to the output signal of the accelerator pedal depression amount detector and the output signal of the vehicle running state detector; and a pre-stored engine output. A memory circuit for storing characteristic data of the automobile such as characteristic data, fuel consumption characteristic data, and starting device characteristic data, and controlling a gear shift with low fuel consumption based on the output signal of the arithmetic circuit and the data of the memory circuit; A drive system control device for an automobile, comprising a control circuit that controls the throttle actuator, and a shift control circuit that inputs a control signal from the control circuit and sends a shift control signal to the automatic transmission.